That doesn't make any sense, to me, at least..................
They needed to explain in the article. The glut is in light sweet crude while most refineries on the gulf coast are set up to process heavy crude (a lot of which is imported).
Most of the increase in domestic production is light sweet crude. It will take time for refineries to make the switch. Opening up exports should give a place on the market for the lighter crude to go. The drop in price would come from efficiency gains in the market and would help domestic producers.